Hello "Annes", you will enjoy walking from Le Puy - it is a truly beautiful path. Yes, in summer it can be quite hot, although the first few weeks will be tempered by the altitude that you will be walking at. However, once you drop off the Aubrac Plateau then the temperature and the humidity are likely to be noticeably higher. I walked this path in 2007 from about August 6th and so if you have any questions feel free to contact me. The beauty of this path is also that most (almost all, in fact) of the churches on the way were open, as opposed to Spain where the opposite seems to occur. I am off on July 3rd (less than 7 months now) to walk the Vezelay path and then onto the Camino del Norte. Enjoy your planning. Janet